Document WAL summarization information functions.

Commit 174c480508ac25568561443e6d4a82d5c1103487 added two new
information functions but failed to document them anywhere.

Discussion: 
http://postgr.es/m/CA+Tgmobvqqj-DW9F7uUzT-cQqs6wcVb-Xhs=w=hzjnxse-k...@mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/f896057e46b06d5ac3f62f7d18f87a7f12185177

Modified Files
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doc/src/sgml/func.sgml | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 80 insertions(+)

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